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Gotthard Base Tunnel - Project of the Century

6/22/16

As the world's longest rail tunnel, the 57 km-long structure is both a novelty and a tour-de-force in tunnel engineering which forms the centerpiece of the new transalpine rail route (NEAT). It embodies the Swiss values of innovation, precision and reliability. These values – upheld at all levels with pride, satisfaction and in a true spirit of partnership by Sika's project team on a daily basis throughout the 14-year construction period and, even before that, during the preliminary phase from 1996 – have helped to cement the success of this once-in-a-lifetime project. The Gotthard base tunnel is an impressive demonstration of how Sika builds with and for people.

A few facts and figures about the tunnel:

Construction period (excluding exploratory work): 17 years

Length: 57 kilometres ( a tunnel system of 152 kilometres in the rock)

Sika’s expertise on the jobsite

The new Gotthard tunnel project required Sika to draw on the full breadth of its construction expertise. Waterproofing systems, construction chemicals know-how and machinery solutions were only part of the package. High-grade shotcrete was used to support the tunnel excavation. This served as the base for the Sikaplan® and Sarnafil® waterproof membranes. The concrete lining was then placed using Sika admixtures so as to achieve the high degree of precision required for the tunnel surface geometry. The flawless concrete finish is a visible testament to the outstanding concreting workmanship.